The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 1990
Filed:
Nov. 29, 1988
Walfried Michaelis, Seevetal, DE;
Claus Weitkamp, Wentorf, DE;
GKSS Forschungszentrum Geesthacht GmbH, Geesthacht, DE;
Abstract
A method and apparatus for the detection of hydrocarbons dissolved in bodies of water and for the determination of their concentration in the water wherein a water sample is introduced into a sealed system in which the hydrocarbons are driven out of solution into a gas phase by heating the sample or exposing it to low pressure, or both, a laser beam of a wavelength or a frequency which provides for at least partial overlapping with the absorption lines of the hydrocarbons is directed through the gaseous phase, a correction laser beam of a wavelength such that it is not subjected to absorption by hydrocarbons is also directed through the gaseous phase to determine the influence of gases other than hydrocarbons and the amount of hydrocarbons in the water iscalculated from the amount of light energy absorbed in the gas phase by any hydrocarbons therein and a correction as determined by the correction laser beam.